package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现自动填充
 *
 */

@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && " +
            "@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行数据填充");
        //获取当前被拦截的方法上的 注解 关于数据库的操作类型
        MethodSignature signature=(MethodSignature)joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获取注解
        OperationType operationType = autoFill.value();  //获取注解上面的操作类型
        //获取当前被拦截的方法参数，即实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];  //获取当前  *方法参数* ，即实体对象
        //根据对应的操作类型，为对应的属性赋值
        if(operationType == OperationType.INSERT){ 
            //需要为 4个值进行赋值
            try {
                //先把在 实体对象  里的四个属性 文件获取
                Method setCreateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setCreateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);

                //再使用 invoke 对属性进行赋值
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
                setCreateUser.invoke(entity, BaseContext.getCurrentId());

                setUpdateTime.invoke(entity, LocalDateTime.now());
                setCreateTime.invoke(entity, LocalDateTime.now());

            }catch (Exception e){
                e.printStackTrace();

            }

        } else if (operationType == OperationType.UPDATE) {
            //只需要为两个值进行赋值
            try {
                Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
                setUpdateTime.invoke(entity, LocalDateTime.now());
                log.info("为{}赋值",entity);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
